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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I like goodls, a command line program for dowloading google drive shares with the original folder structure. After being frustrated by having browsers trying to download and failing, I'm happy I made the time investment of figuring out how to use it. You'll need to get a google API for some features though.
Which reminds me… It's not open source, but https://archive.is/ is great for archiving pages that might change or be removed.
NOTE:
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Hence, a higher number means a more popular project.